CN1855753B - Download power balancing controlling method and device - Google Patents

Abstract

The invention discloses a downlink power balance control method and device, which are applied in a wideband code division multiple access system. The method includes: measuring the downlink transmission power of each wireless link in real time, and obtaining the maximum measured downlink transmission power and the minimum measured downlink transmission power power; determine a reference power value according to the maximum measured downlink transmit power and the minimum measured downlink transmit power, the reference power value is between the maximum measured downlink transmit power and the minimum measured downlink transmit power; according to the The downlink transmission power of the wireless link is adjusted according to the determined reference power value to perform power balance control. The device includes a measuring device, a reference power determining device and a balance control device. The present invention can make the reference power reflect the actual situation of the current downlink transmission power, and further improve the system performance.

Description

Downlink power balance control method and device

Technical Field

The present invention relates to a power control method, and more particularly, to a downlink power balance control method and apparatus in a Wideband Code Division Multiple Access (WCDMA) system.

Background

In a WCDMA system, when a User Equipment communicates with a UMTS Terrestrial Radio Access Network (UTRAN), a Radio Resource Control (RRC) is established, and one RRC establishes one or more Radio links between the UTRAN and the User Equipment (UE). Due to the influence of uplink power control (TPC) error codes, power drift can occur between different downlink wireless links, thereby reducing the system performance. The power drift is more severe after the fast power control is used in the downstream. Therefore, the WCDMA protocol prescribes that a downlink power balancing algorithm is used to control the downlink transmit power, and the purpose of the downlink power balancing algorithm is to balance the power between different wireless links as much as possible and reduce the downlink power drift. During soft switching, a Source Radio Network Controller (SRNC) sends a downlink power control request message to a base station, and adjusts downlink transmission power of each Radio link so that the downlink transmission power of each Radio link is as equal as possible.

Currently, in the downlink inner loop power control balancing process, the downlink transmission power on each radio link is updated according to the following formula:

P(k+1)＝P(k)+P_TPC(k)+P_bal(k) (1)

wherein, P (k) and P (k +1) are the downlink transmission power of the k-th and k + 1-th time slots respectively, P_TPC(k) Is the change of power determined by the inner loop power control, and the value of the change is determined by the network side. The network side can select P_TPC(k) The calculation is performed according to equation (2):

<math><mrow> <msub> <mi>P</mi> <mi>TPC</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfenced open='{' close=''> <mtable> <mtr> <mtd> <mo>+</mo> <msub> <mi>&Delta;</mi> <mi>TPC</mi> </msub> </mtd> <mtd> <mi>if</mi> <msub> <mi>TPC</mi> <mi>est</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mo>-</mo> <msub> <mi>&Delta;</mi> <mi>TPC</mi> </msub> </mtd> <mtd> <mi>if</mi> <msub> <mi>TPC</mi> <mi>est</mi> </msub> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mn>0</mn> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> <mrow> <mo>[</mo> <mi>dB</mi> <mo>]</mo> </mrow> <mo>.</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow></math>

p may also be selected_TPC(k) Calculation according to equation (3)

Wherein,

this can be obtained from equation (4):

P_bal(k) is the power value adjusted by the power balancing process. The adjustment of the transmitting power of each time slot controlled by the inner ring power is optional, the step length can be 0.5, 1, 1.5 and 2dB, the specific size is determined by the network side, but the downlink power balance algorithm does not definitely stipulate the adjustment value of each time slot of the inner ring, but requires to adjust the total sigma P in one adjustment period_bal(different equipment manufacturers may have different implementation manners for the power control step length), and at the same time, the maximum adjustment power control step length cannot exceed 1dB within a certain time slot number. Sigma P_balIs represented by the following formula:

∑P_bal＝(1-r)×(P_ref+P_{P_CPICH}-P_init) (5)

wherein r is the adjustment ratio, P_refIs a reference power value, P_initFor starting to adjust power at the momentHorizontal transmission power value, P_P-CPICHIs the pilot power.

Currently, the WCDMA protocol does not specify how to select the reference power, and usually the reference power is subjected to downlink power balancing by taking a median value according to a preconfigured downlink power control range, and after service reconfiguration, the reference power is not reconfigured. Because the range of downlink power control is large, the actual condition of the current downlink transmission power is not reflected by the intermediate value of the reference power, and in addition, if the reference power is not reconfigured after service reconfiguration, when the difference between the transmission power and the reference power is large, the power required to be adjusted in a time slot is large, and in an extreme case, the action of inner loop power control may be offset or the downlink power balance control cannot balance the power difference among the wireless links, so that the system performance is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a downlink power balance control method and device, so that the reference power reflects the actual situation of the current downlink transmitting power and the system performance is improved.

In order to solve the above problem, the downlink power balance control method of the present invention includes:

A. measuring downlink transmitting power of each wireless link in real time to obtain maximum measured downlink transmitting power and minimum measured downlink transmitting power;

B. determining a reference power value according to the maximum measured downlink transmission power and the minimum measured downlink transmission power, wherein the reference power value is between the maximum measured downlink transmission power and the minimum measured downlink transmission power;

C. and adjusting the downlink transmitting power of the wireless link according to the determined reference power value to carry out power balance control.

Wherein, step C includes:

determining the power control step length P of each wireless link downlink power balance according to the reference power value_bal；

According to the determined power control step length P_balAnd inner loop power control value P of each wireless link_TPCDetermining the adjusted power of the downlink transmitting power of each wireless link in the current time slot;

and adjusting the downlink transmitting power of each wireless link according to the determined power to carry out power balance control.

Wherein step B determines the reference power value according to the following formula:

<math><mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow></math>

wherein P is_refIs a reference power;

a is a configurable parameter, and a is more than or equal to 0 and less than or equal to 100;

P_maxmeasuring downlink transmission power for maximum in downlink radio link；

P_minMeasuring downlink transmission power for the minimum in the downlink radio link;

P_CPICHmaxis corresponding to P_maxThe downlink pilot power of;

P_CPICHminis corresponding to P_minThe downlink pilot power.

And step A, when the initial wireless link is not measured to obtain the downlink transmitting power, directly using the initial downlink transmitting power value as the measuring power value of the wireless link.

In addition, when the service is reconfigured, the reference power value is reconfigured.

Wherein the reconfigured reference power value is determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})$

wherein P is_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

Correspondingly, the downlink power balance control device of the invention comprises:

the measuring device is used for measuring the downlink transmitting power of each wireless link in real time and acquiring the maximum measured downlink transmitting power and the minimum measured downlink transmitting power;

a reference power determining device, configured to determine a reference power value according to the maximum measured downlink transmit power and the minimum measured downlink transmit power, where the reference power value is between the maximum measured downlink transmit power and the minimum measured downlink transmit power;

and the balance control device is used for adjusting the downlink transmitting power of the wireless link according to the determined reference power value to carry out power balance control.

Wherein, the balance control device comprises:

a power control step length calculation device for determining the power control step length P of downlink power balance of each wireless link according to the reference power value_bal；

Adjusting power determining means for determining work based on said determined workStep length P of control_balAnd inner loop power control value P of each wireless link_TPCDetermining the adjusted power of the downlink transmitting power of each wireless link in the current time slot;

and the power adjusting device adjusts the downlink transmitting power of each wireless link according to the determined power to carry out power balance control.

Wherein the reference power determining means may determine the reference power value according to the following formula:

<math><mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow></math>

wherein P is_refIs a reference power;

a is a configurable parameter, and a is more than or equal to 0 and less than or equal to 100;

P_maxmeasuring downlink transmit power for a maximum in a downlink radio link;

P_minmeasuring downlink transmission power for the minimum in the downlink radio link;

P_CPICHmaxis corresponding to P_maxThe downlink pilot power of;

P_CPICHminis corresponding to P_minThe downlink pilot power.

When the initial wireless link is not measured to obtain the downlink transmitting power, the measuring device directly uses the initial downlink transmitting power value as the measuring power value of the wireless link.

In addition, the device also comprises a reconfiguration device which is used for reconfiguring the reference power value when the service is reconfigured.

Wherein the reconfigured reference power value may be determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})$

wherein P is_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

Compared with the prior art, the invention has the following beneficial effects:

the invention can make the reference power reflect the actual condition of the current downlink transmitting power by measuring the downlink transmitting power of each wireless link in real time and determining the reference power value between the measured maximum measured downlink transmitting power and the measured minimum downlink transmitting power according to the measuring result;

in addition, in the invention, when the service is reconfigured, the reference power value is also reconfigured, so that the problem that the power required to be adjusted in a time slot is very large when the difference between the transmission power and the reference power is very large can be avoided, and the system performance is further improved.

Drawings

FIG. 1 is a schematic diagram of a WCDMA system architecture to which the present invention is applied;

fig. 2 is a flowchart of a downlink power balance control method according to the present invention;

fig. 3 is a schematic diagram of the downlink power balance control apparatus according to the present invention.

Detailed Description

Referring to fig. 1, the WCDMA system architecture for the present invention is shown.

The WCDMA system consists of a Core Network (CN), UTRAN and UE. The interface between the CN and the UTRAN is defined as Iu interface, and the interface between the UTRAN and the UE is defined as Uu interface.

Wherein the core network handles the switching and routing of voice calls and data connections with external networks within the WCDMA system.

The UTRAN includes a number of Radio Network Subsystems (RNS) connected to the CN over an Iu interface. An RNS includes a Radio Network Controller (RNC) and one or more Node bs. Node B is the base station of WCDMA system, which is connected with RNC by Iub interface, and Node B is connected with RNC by Iub interface, which supports FDD mode, TDD mode or dual mode. The Node B includes one or more cells.

The UE is a user terminal device, interacts with a network device through a Uu interface (wireless interface), and provides various service functions of a circuit domain and a packet domain, including ordinary voice, mobile multimedia, Internet application, and the like, for a user.

A Radio Resource Control (RRC) is established when the UE and the UTRAN communicate, and one RRC establishes one or more Radio links between the UTRAN and the UE. The invention is mainly applied to balance control of downlink transmitting power of each wireless link between UE and UTRAN.

Referring to fig. 2, it is a flowchart of a downlink power balance control method according to the present invention.

In specific implementation, the base station compares the measured signal-to-interference ratio of each time slot with a target signal-to-interference ratio, determines whether to increase the power of one power control step (the measured signal-to-interference ratio is smaller than the target signal-to-interference ratio) or decrease the power of one power control step (the measured signal-to-interference ratio is larger than the target signal-to-interference ratio), and then measures the downlink transmission power of each wireless link in real time in step 10; in this embodiment, the SRNC in the UTRAN sends measurement control to the base station to measure the downlink transmission power of different radio links, and particularly, when the downlink transmission power is not measured in the initial radio link, the initial downlink transmission power value is directly used as the measurement power value of the radio link, and the following formula (6) can be used in the present invention to calculate the downlink initial transmission power:

<math><mrow> <msub> <mi>P</mi> <mi>Initial</mi> </msub> <mo>=</mo> <mfrac> <mi>R</mi> <mi>W</mi> </mfrac> <mo>&times;</mo> <msub> <mrow> <mo>(</mo> <mi>Ed</mi> <mo>/</mo> <mi>N</mi> <mn>0</mn> <mo>)</mo> </mrow> <mi>DL</mi> </msub> <mo>&times;</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>p</mi> <mi>CPICH</mi> </msub> <msub> <mrow> <mo>(</mo> <mi>Ec</mi> <mo>/</mo> <mi>N</mi> <mn>0</mn> <mo>)</mo> </mrow> <mi>CPICH</mi> </msub> </mfrac> <mo>-</mo> <mi>&alpha;</mi> <msub> <mi>P</mi> <mi>Total</mi> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow></math>

where R is the user rate, (Eb/NO)_DLIs the signal-to-interference ratio at which the bearer meets the quality requirement, W is the chip rate, P_CPICHIs the pilot power, P_totalIs the carrier power and alpha is the downlink orthogonalization factor.

And step 11, determining a reference power value between the measured maximum measured downlink transmission power and the measured minimum measured downlink transmission power according to the measurement result, and setting a reference power between the maximum measured downlink transmission power and the measured minimum measured downlink transmission power so that the reference power reflects the actual condition of the current downlink transmission power, thereby balancing the system at a fast speed.

In the present invention, the reference power value can be calculated and determined by using the following formula:

<math><mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow></math>

wherein P is_refFor reference power, a is a configurable parameter (0 ≦ a ≦ 100), by which the setting of the reference power can be optimized, and the parameter can be specifically configured by system-level simulation or measurement analysis in a specific real environment.

In addition, P_maxFor maximum measured downlink transmission power, P, in a downlink radio link_minDownstream transmission for minimum measurement in a downlink radio linkPower, which is obtained by periodic measurements;

P_CPICHmaxis corresponding to P_maxOf the downlink pilot power, P_CPICHminIs corresponding to P_minThe downlink pilot power. P_CPICHmaxAnd P_CPICHminThe network planning determines in advance, and the system is configured in advance, so that the dynamic adjustment process of the reference power is determined.

Step 12, determining the power control step length P of each wireless link downlink power balance according to the reference power value_bal；

Specifically, the formula (5) adopted in the background art can be adopted to calculate the power control step length P_balSince it is the prior art, it is not described herein in detail.

Step 13, according to the determined power control step length P_balAnd inner loop power control value P of each wireless link_TPCDetermining the adjusted power of the downlink transmitting power of each wireless link in the current time slot;

and step 14, adjusting the downlink transmitting power of each wireless link according to the determined power to perform power balance control.

In addition, after the service reconfiguration, the transmission power meeting the communication quality requirement is different from that before the reconfiguration. In the present invention, when the service is reconfigured, the reference power value also needs to be reconfigured, and the principle thereof is briefly described below.

Generally, the downlink transmission channel multiplexing process in the WCDMA system is as follows:

addition of Cyclic Redundancy Check (CRC) codes of Transport Blocks (TB);

TB concatenation and coding code block segmentation;

channel coding (Turbo coding or convolutional coding);

wireless frame equalization;

carrying out first interleaving;

segmenting a wireless frame;

rate matching (multiplexing/puncturing);

multiplexing transmission channels;

segmenting a physical channel;

second interweaving;

and (4) mapping a physical channel.

In the above process, the number of service bits and the spreading factor before and after service reconfiguration may change, but under the condition of different rates before rate matching, if the same bit error rate needs to be achieved, the signal-to-noise ratio required by each bit is the same.

Based on this, the reference power value for reconfiguration in the present invention is determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})---\left(8\right)$

in the above formula, "before" represents a certain service before reconfiguration, "after" represents a certain service after reconfiguration, and G_RMIs the rate matching gain, obtained by calculating the ratio of the number of bits after rate matching to the number of bits before rate matching, G_SFIs the spreading gain, and is directly expressed in terms of spreading factor.

In particular P_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

The reference power value of the invention is closer to the actual network condition because the change of the bit number after rate matching and before rate matching before and after reconfiguration and the change of the spreading factor are considered.

Next, a downlink power balance control apparatus according to another aspect of the present invention will be described.

Referring to fig. 3, it is a schematic diagram of a downlink power balance control apparatus according to the present invention.

The downlink power balance control device comprises:

a measuring device 20, configured to measure downlink transmission power of each wireless link in real time; when the initial wireless link is not measured to obtain the downlink transmitting power, the measuring device directly uses the initial downlink transmitting power value as the measuring power value of the wireless link.

A reference power determining device 21, configured to determine a reference power value between the measured maximum measured downlink transmit power and the measured minimum measured downlink transmit power;

the reference power determining means 21 described in the present invention determines the reference power according to the following formula:

<math><mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow></math>

wherein a is a configurable parameter, 0 ≦ a ≦ 100;

pmax is the maximum measured downlink transmitting power in the downlink wireless link;

pmin is the minimum measured downlink transmitting power in the downlink wireless link;

PCPICHmax is downlink pilot power corresponding to Pmax;

PCPICHmin is the downlink pilot power corresponding to Pmin.

For specific meanings, reference is made to the foregoing description, which is not repeated herein.

And a balance control device 22, configured to adjust the downlink transmission power of the wireless link according to the determined reference power value to perform power balance control. In a specific implementation, the balance control device includes:

a power control step length calculating device 221, configured to determine a power control step length P for downlink power balance of each radio link according to the reference power value_bal；

An adjusting power determining device 222, configured to determine the power control step length P according to the determined power control step length P_balAnd inner loop power control value P of each wireless link_TPCDetermining the adjusted power of the downlink transmitting power of each wireless link in the current time slot;

and the power adjusting device 223 adjusts the downlink transmitting power of each wireless link according to the determined power to perform power balance control.

In addition, the present invention further includes a reconfiguration device 23, configured to reconfigure the reference power value when the service is reconfigured. According to the foregoing description, the reference power value reconfigured in the present invention can also be determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})$

wherein P is_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

The meaning of the specific parameters can refer to the foregoing description, and are not repeated herein.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (6)

1. A downlink power balance control method is applied to a wideband code division multiple access system, the wideband code division multiple access system comprises a UMTS terrestrial radio access network and user equipment, a wireless link is established between the UMTS terrestrial radio access network and each user equipment, and the method is characterized by comprising the following steps:

A. measuring downlink transmitting power of each wireless link in real time to obtain maximum measured downlink transmitting power and minimum measured downlink transmitting power;

B. determining a reference power value according to the maximum measured downlink transmission power and the minimum measured downlink transmission power, wherein the reference power value is between the maximum measured downlink transmission power and the minimum measured downlink transmission power;

C. adjusting the downlink transmitting power of the wireless link according to the determined reference power value to carry out power balance control;

when the service reconfiguration is also included, the reference power value is reconfigured; wherein step B determines the reference power value according to the following formula:

<math> <mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </math>

wherein P is_refIs a reference power;

a is a configurable parameter, and a is more than or equal to 0 and less than or equal to 100;

P_maxmeasuring downlink transmit power for a maximum in a downlink radio link;

P_minmeasuring downlink transmission power for the minimum in the downlink radio link;

P_CPICHmaxis corresponding to P_maxThe downlink pilot power of;

P_CPICHminis corresponding to P_minThe downlink pilot power of;

the reconfigured reference power value is determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})$

wherein P is_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

2. The downlink power balance control method according to claim 1, wherein step C includes:

determining the power control step length P of each wireless link downlink power balance according to the reference power value_bal；

According to the determined power control step length P_balAnd inner loop power control value P of each wireless link_TPCDetermining the adjusted power of the downlink transmitting power of each wireless link in the current time slot;

and adjusting the downlink transmitting power of each wireless link according to the determined power to carry out power balance control.

3. The downlink power balance control method according to claim 1 or 2, wherein step a directly uses the initial downlink transmission power value as the measurement power value of the radio link when no downlink transmission power is measured on the initial radio link.

4. A downlink power balance control device is applied to a wideband code division multiple access system, the wideband code division multiple access system comprises a UMTS terrestrial radio access network and user equipment, a wireless link is established between the UMTS terrestrial radio access network and each user equipment, and the downlink power balance control device is characterized by comprising:

the measuring device is used for measuring the downlink transmitting power of each wireless link in real time and acquiring the maximum measured downlink transmitting power and the minimum measured downlink transmitting power;

a reference power determining device, configured to determine a reference power value according to the maximum measured downlink transmit power and the minimum measured downlink transmit power, where the reference power value is between the maximum measured downlink transmit power and the minimum measured downlink transmit power;

the balance control device is used for adjusting the downlink transmitting power of the wireless link according to the determined reference power value to carry out power balance control;

the reconfiguration device is used for reconfiguring the reference power value when the service is reconfigured;

wherein the reference power determining means determines the reference power according to:

<math> <mrow> <msub> <mi>P</mi> <mi>ref</mi> </msub> <mo>=</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>max</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>max</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>a</mi> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>min</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mrow> <mi>CPICH</mi> <mi>min</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </math>

wherein a is a configurable parameter, 0 ≦ a ≦ 100;

P_maxmeasuring downlink transmit power for a maximum in a downlink radio link;

P_minmeasuring downlink transmission power for the minimum in the downlink radio link;

P_CPICHmaxis corresponding to P_maxThe downlink pilot power of;

P_CPICHminis corresponding to P_minThe downlink pilot power of;

the reconfigured reference power value is determined according to the following formula:

$P_{\mathrm{ref},\mathrm{after}}=P_{\mathrm{ref},\mathrm{before}}+10\mathrm{Log}10(\frac{G_{\mathrm{RM},\mathrm{before}}}{G_{\mathrm{RM},\mathrm{after}}}*\frac{G_{\mathrm{SF},\mathrm{before}}}{G_{\mathrm{SF},\mathrm{after}}})$

wherein P is_ref，beforeThe reference power of the service before reconfiguration;

P_ref，afterthe reference power of the service after reconfiguration;

G_RM，beforematching gain for pre-reconfiguration rate;

G_RM，aftermatching gain for the reconfigured rate;

G_SF，beforeis a pre-reconfiguration spreading factor;

G_SF，afterto reconfigure the post-spreading factor.

5. The downlink power balance control device according to claim 4, wherein the balance control device comprises:

a power control step length calculation device for determining the power control step length P of downlink power balance of each wireless link according to the reference power value_bal；

An adjusting power determining device for determining the power control step length P according to the determined power control step length_balAnd inner loop power control value P of each wireless link_TPCDetermining the downlink transmitting power of each wireless link in the current time slotThe adjusted power level;

and the power adjusting device adjusts the downlink transmitting power of each wireless link according to the determined power to carry out power balance control.

6. The downlink power balance control device according to claim 4 or 5, wherein when the downlink transmission power is not measured in the initial wireless link, the measuring device directly uses the initial downlink transmission power value as the measurement power value of the wireless link.

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